Ole ostad and mauritz ii



No. 624,673. Patented Imy 9, |899. 0 OSTAD & M H WELTA ADJUSTABLE STOVE GRATE.

(Application tiled Feb. 14, 1898.) (No Model.)

Nrrn STATES ATENT OFFICE.

OLE OSTAD AND MAURITZ H. WELTA, OF FARWELL, MINNESOTA, ASSIGNORS OF ONE-HALF TO CARL F. SAME PLACE.

HAVKINSON AND MAGNUS HAVKINSON, OF

ADJUSTABLE sTovE-G RATE.

SPECIFICATION forming part of Letters Patent No. 624,673, dated May 9 1899. Application filed February 14, 1898.` Serial N0.670|1'77. (N0 model-l T0 @ZZ whom, t may concern/ Be it known that we, OLE OSTAD and MAU- RITZ Il. WELTA, citizens of the United States, residing at Farwell, in the county of Pope and State of Minnesota, have invented certain new and useful Improvements in Adjustable Stove-Grates; and we do hereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to stoves of the class which have verticallyadjustable grates, and is directed particularly, first, to an improved device for adjusting the grate as an entirety into different vertical positions and there holding the same, and, secon d, to an improved and simplified construction of the grate its'elf.

To the ends above indicated ourinvention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

The preferred form of ourinvention is illustrated in the accompanying drawings, wherein like characters indicate like parts throughout the several views.

Figure 1 is a side elevation of the fire-box end of a stove provided with our improved attachments. Fig. 2 is a vertical transverse section of the parts shown in Fig. 1. Fig. 3 is a perspective view showing a portion of the grate-bar and the device for vertically adjusting the grate. Fig. f1 is a perspective view oi' a portion of the grate, some parts being partially and some wholly' removed from working positions; and Fig. 5 is a horizontal section taken through a portion of the lirebox approximately on the line x5 x5 of Fig. 2.

.1 indicates the-main body portion of the stove, which, as shown, is provided with a front end door 2, a side door 3, griddle-hole covers 4t, and a fire-box 5, that extends downward to l'orm the ash-pit 6 in which the ashpan 7 is located. As shown in Fig. 5 the sides of the re-box 5 are formed with vertical corrugations 8, for a purpose which will hereinafter more fully appear.

A single flat grate-bar 9 is passed entirely,

through the lower portion of the lire-box 5,lon gitudinallyand cen trally thereof,with its ends working in and projectingthrough vertical slots 10, formed in the end plates ot' the firebox. of a multiplicity of grate lingers or sections 11, that are provided at theirlower ends with perforated heads l2, that tit onto the common bar 9, the perforations in said heads being of the form of the cross-section of the bar 9, but slightly larger' in order to give the fingers a slight rocking movement on the bar. These fingers 11 as preferably constructed have the outline of a compound curve. When they are placed in working position on the bar 9, the adjacent members cooperate in pairs and form a grate that is approximately Y-shaped in cross-section, one of the said adjacent grate-sections projecting to form one prong and the other projecting in an op-4 posite direction to form the other prong or side of said grate. The stein portions of the cooperating adjacent grate-fingers 11 are cut away, as shown at 13, so that they overlap and interlock each other, and said fingers 11 are cut away atV both sides, as shown at 14, so as to form draft-passages that extend across the bottom ofthe grate, at some little distance upward on the prongs or sides of the same.

The ends of the grate formed by the sections orngers 11 are closed by means of end plates 15, that are perforated and passed onto the grate-bar 9 in a manner very similar to said sections 11. These end plates 15 work close to the ends of the hre-box 5 and are pro vided with depending tail-sections 1G, thatA work over and keep the slots 10 always closed under the adjustments or vertical movements of the grate. At its projecting ends, or just outward of the sides of the tire-box, the gratebar 9 is provided with passages or perforaf tions 17.

The device for vertically adjusting the grate will now be described.

The body of the grate properis made up 18 indicates a shaft which extends through one through each ofthe passages or perfora- IOC) tions 17 of the grate-bar 9, and the right-hand member is provided with a removable fingerpiece 20, by means of which the said involute cam-bars 19 and shaft 1S may be rotated to simultaneously raise or lower both ends of the grate-bar 9. In this manner, as is obvious, the grate as an entirety may be raised yand lowered at will, so as to bring the body of burning coal or other fuel close to the top of the stove or griddle covers 4: Whenever it is desired. There is sufficient friction between the grate-bar 9 and the involute cam-bars 19 to hold the grate in whatever position it may be set. As shown, the cam-bars 19 are rigidly secured to the shaft 18, and said shaft 18 is sectioned or divided at its central portion, as shown at 21, the parts being normally secured together by screws 22.

By reference particularly to Fig. 5 it Will be noted that the free ends of the grate fin-- gers or sections 11 work in the corrugations S in the sides of the fire-box. These corrugations 8 thus serve as guides or runways for the said fingers. As the said lingers or sections are loose on their bar 9, they may readily adapt themselves to these corrugations and will always run close to the sides of the lire-box. They will always bear against the sides of the fire-box, but will never tightly press the same, and the action of expansion and contraction of the various parts will not increase or decrease this frictional engagement.

The importance of being able to readily adjust the grate into different vertical positions or intoV different altitudes is Well understood.

It not only saves fuel, but it makes possible the most advantageous use of coal or fuel which may be left on the grate after the fire has died down. It also makes it possible to get the greatest heating effect on the top of fthe stove from the burning fuel in whatever condition it may be.

The construction above described is very simple,eflicient, and of small cost. The grate sections or fingers may be readily replaced at any time, and the grate may be extended or contracted by adding to or taking from the number of sections or fingers employed. The grate, as shown, is so constructed that it is adapted to burn either coal or Wood.

It is important to note that the involute cam rods or bars 19 have a positive action on the grate-bar 9, so that the grate will loe positively forced down as well as up.

It will of course be understood that various alterations in the details of construction above specifically described may be made without vdeparting from the scope of our invention.

The expression stove is used generically and is intended to include ranges and similar devices. The expression involute cam bars or rods is intended to describe such bars or rods as are coiled or turned in a given plane in la manner which gives them approximately or approaches an involute curve.

It would be within the scope of our invention to utilize the spiral or involute cam bars or rods even. if the same were placed in the in terior of the stove instead of outside, as shown in the drawings.

What we claim, and desire to secure by Letters Patent of the United States, is as follows:

1. In a stove, the combination with the firebox thereof, of a grate provided with projecting perforated parts, and a grate-adjuster involving a shaft provided with a pair of involute cam rods or bars working with a cam action through the said perforated parts of the grate, substantially as described.

2. In a stove, the combination with the fire box thereof, of a vertically-adjustable grate provided with projecting perforated parts that work through vertical slots in the stove, and a grate-adjuster involving a shaft passed through the stove and provided at its projecting endsv with the involute cam bars or rods that work through said perforated projecting parts of the grate, substantially as described.

3. In a stove, the combination with the firebox thereof, of a grate involving the single bar 9 and the series of lingers or sections l1 loosely slipped onto said bar 9 in alternate order and forminga grate that is substantially Y-shaped in cross-section, substantially as described.

4. In a stove, the combination with the firebox thereof, of the grate made up of the single bar 9, the grate-sections or fingers 11 loosely slipped onto said bar 9 and forming a grate that is substantially Y- shaped in cross-section, andthe end plates 15 also slipped onto said bar 9, substantially as described.

5. lIn a stove, the combination with the firebox thereof, formed with the vertical corrugations S, of the vertically-adjustable grate involving the single bar 9 and the multiplicity of fingers or sections 11 loosely placed on said bar 9 and working with their free ends in said corrugations, substantially as described.

In testimony whereof we affix our signatures in presence of two witnesses.

OLE OSTAD. MAURITZ H. WELTA.

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